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THE NEBVOUS SYSTEM 317 Doran (323) has shown that the ossicles in the middle ear present features which resemble those of Man; but, taken as a whole, those of the Chimpanzee resemble the human condition most closely. And van Kampen pointed out that the whole structure of the tympanum is similar in the Apes and Man. Man, however, has advanced beyond the Apes in the specialization of the tympanic bone into a tympanic plate.